// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Buffers;
using System.IO.Pipelines;
using BenchmarkDotNet.Attributes;
using Microsoft.AspNetCore.Connections;
using Microsoft.AspNetCore.Connections.Features;
using Microsoft.AspNetCore.Internal;
using Microsoft.AspNetCore.SignalR.Client;
using Microsoft.AspNetCore.SignalR.Microbenchmarks.Shared;
using Microsoft.AspNetCore.SignalR.Protocol;
using Microsoft.AspNetCore.SignalR.Tests;
using Microsoft.Extensions.DependencyInjection;

namespace Microsoft.AspNetCore.SignalR.Microbenchmarks;

public class HubConnectionStartBenchmark
{
    private HubConnection _hubConnection;
    private TestDuplexPipe _pipe;
    private ReadResult _handshakeResponseResult;

    [GlobalSetup]
    public void GlobalSetup()
    {
        var writer = MemoryBufferWriter.Get();
        try
        {
            HandshakeProtocol.WriteResponseMessage(HandshakeResponseMessage.Empty, writer);
            _handshakeResponseResult = new ReadResult(new ReadOnlySequence<byte>(writer.ToArray()), false, false);
        }
        finally
        {
            MemoryBufferWriter.Return(writer);
        }

        _pipe = new TestDuplexPipe();

        var hubConnectionBuilder = new HubConnectionBuilder();
        hubConnectionBuilder.WithUrl("http://doesntmatter");

        var delegateConnectionFactory = new DelegateConnectionFactory(endPoint =>
        {
            var connection = new DefaultConnectionContext();
            // prevents keep alive time being activated
            connection.Features.Set<IConnectionInherentKeepAliveFeature>(new TestConnectionInherentKeepAliveFeature());
            connection.Transport = _pipe;
            return new ValueTask<ConnectionContext>(connection);
        });
        hubConnectionBuilder.Services.AddSingleton<IConnectionFactory>(delegateConnectionFactory);

        _hubConnection = hubConnectionBuilder.Build();
    }

    private void AddHandshakeResponse()
    {
        _pipe.AddReadResult(new ValueTask<ReadResult>(_handshakeResponseResult));
    }

    [Benchmark]
    public async Task StartAsync()
    {
        AddHandshakeResponse();

        await _hubConnection.StartAsync();
        await _hubConnection.StopAsync();
    }
}

public class TestConnectionInherentKeepAliveFeature : IConnectionInherentKeepAliveFeature
{
    public bool HasInherentKeepAlive { get; } = true;
}
